I've included a link to an article that was written on April 30th with an uncanny warning and decryption of what the north was capable of.

SEOUL, South Korea - U.S. authorities on Wednesday eyed North Korea as the origin of the widespread cyber attack that overwhelmed government Web sites in the United States and South Korea, although they warned that the complexities of the massive Internet make it difficult to identify the attackers quickly.

The powerful attack that stretched on for days over the holiday weekend targeted dozens of government and private sites, and underscored how unevenly prepared the U.S. government is to block such multipronged assaults. While Treasury Department and Federal Trade Commission Web sites were shut down by the malicious software attack, others such as the Pentagon and the White House were able to fend it off with little disruption.